One hundred and fifty three bridges and forty five tunnels carry Mizoram's railway through the hills
Background
The engineering of the Bairabi-Sairang line is what makes Mizoram's rail connectivity possible, and it is in the news as the state presses for railway extension towards its international border. The project comprises 153 bridges, including 55 major bridges, 88 minor bridges and 10 Road Over Bridges or Road Under Bridges. As many as six bridges exceed 70 metres in height, with the tallest rising up to 114 metres, which is 42 metres taller than Delhi's Qutub Minar. The alignment also passes through 45 tunnels stretching over almost 16 kilometres.
In plain words
Road Over Bridge Road Over Bridge — A road carried over a railway line on a bridge.
Pier Bridge pier — The vertical support that carries a bridge deck.